Manual 02007
DSLC Digital Synchronizer and Load Control
Woodward
29
14.
Sync Timeout
is the interval over which the synchronizer will attempt to get
synchronization. A value of 0 seconds disables the Sync Timeout function.
The interval begins when generator voltage is detected (generator A phase
voltage above 40 V L-N) and either the run or permissive mode select input
is activated. Failure to get a CB Aux contact closure within the specified time
will result in a synch timeout alarm. The synchronizer must be set to off
mode to clear the interval timer and alarm.
15.
Sync Timeout Alarm
enables or disables the alarm generated by
exceeding the synch timeout interval without getting synchronization.
16.
Auto Re-Synchronize
enables or disables the synchronizer function after
achieving synchronization. Synchronization is assumed to have been
achieved if one Reclose Delay time interval passes with the CB Aux contact
closed. If this set point is set to disabled, the synchronizer is set to auto-off
mode after synchronizing. The synchronizer must be set to the off mode and
then back to the desired operating mode to resume operation. If this set
point is set to Enabled, the synchronizer will automatically restart in the
selected operating mode when synchronization is lost, as indicated when
the CB Aux contact opens. On restart, the synch timeout timer and close
attempts count are reset to their specified values.
Menu 2—Load Control
1.
Load Control Gain
determines how fast the load control responds to a load
error. Gain is set to provide stable load control. For integrating load control
mode, use 0.05 as the initial load control gain. In proportional load control
mode, the load control gain is the gain setting in base load mode and during
load control ramp time. In proportional load control mode, use 0.25 as the
initial setting.
2.
Load Stability
compensates for lags in the load control loop. It prevents
slow hunting and controls damping (overshoot or undershoot) after a load
disturbance. This adjustment is in effect only in the integrating load control
mode.
3.
Load Derivative
adjusts the rate of change in speed bias output during a
load transient. This adjustment is in effect only in the integrating load control
mode.
4.
Load Control Mode
selects the operating mode of the base load control
algorithm. In proportional mode, the speed bias output is proportional to the
error between load and load reference. In proportional mode, a shift in bus
frequency will result in a shift in load. Use proportional mode when bus
frequency remains stable over time.
In integrating mode, speed bias output integrates to the level required to get
zero error between load and the load reference. Load Stability and Load
Derivative set points are only in effect in the integrating load control mode.
Use this mode in applications where utility frequency may vary.
NOTE
An integrating load control will react dynamically with the engine speed
control and any other system control, and with the DSLC Process and
VAR/PF control functions. Dynamic adjustment of each of these functions
must be repeated until satisfactory performance is obtained under all
operating conditions.